The ring band is felted wool with a bit of stretch, so fits about US size 8 to 10.5

The vintage doll's eye has a mind of it's own - when the Eye is held vertical it is 'Awake' and when it is horizontal it is 'Asleep'. So, when you wear your 'Eye' as a ring, your hand movement will make the Eye blink....it is a delicate piece though and should not be shaken too hard!